Question
Volume of M / 8 KMnO _4 solution required to react completely with 25.0 ~cm ^3 of M / 4 FeSO _4 in acidic medium is.
BITSAT
Chemistry
Redox Reactions
2024
BITSAT 2024 (Memory Based Paper 3)
BITSAT Chemistry Question (2024) — Solution
Options
- A. 8.0 mL
- B. 5.0 mL
- C. 15.0 mL
- D. 10.0 mL
Answer
D. 10.0 mL
Step-by-step solution
The balance ionic equation for the reaction is MnO _4^ - +5 Fe ^ 2+ +8 H ^ + Mn ^ 2+ +5 Fe ^ 3+ +4 H _2 O From the above equation it is clear that 1 mole of KMnO _4=5 moles of FeSO _4. Apply molarity equation to balance the redox reaction aligned M_1 V_1 n_1 ( KMnO _4 ) & = M_2 V_2 n_2 ( FeSO _4 ) \\ 1 V_1 8 1 & = 1 4 25 5 \\ V_1 & = 1 25 8 4 5 \\ V_1 & =10 ~cm ^3 or V_1=10.0 ~mL aligned
Related: Chemistry — Redox Reactions · All PYQ Banks